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Add 28/80 and 7/40

28/80 + 7/40 is 21/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 40 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 80 × 1 = 80,
    28/80 = 28 × 1/80 × 1 = 28/80
  3. Likewise, for the 2nd fraction, since 40 × 2 = 80,
    7/40 = 7 × 2/40 × 2 = 14/80
  4. Add the two like fractions:
    28/80 + 14/80 = 28 + 14/80 = 42/80
  5. 42/80 simplified gives 21/40
  6. So, 28/80 + 7/40 = 21/40

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